You have to look at manufacture's data as a good starting point.
There are lots of variables, such as your lighmeter precision, your metering technique, your termometer, etc.

So, I would start with standard times and exposute, and then look for:

- Is shadow detail good? If not, increase exposure (dowrate your film speed for metering).
- Is contrast OK? If lacking, increase development time.
- Are higlights blown up? If so, reduce your development time.

The above shall be done over a few rolls of film, with different scenes.

Have fun,

Jorge O